Wettable powder
Take 1 part of wettable powder, add 200 parts of water, hold in a glass cup, shake it for a certain period of time, observe the suspension.
If the drug precipitates slowly, the suspension is good. In case of poor quality, silicone additives or 0.10% neutral detergent should be added before use to increase the wetness and spreadability.
If the wettable powder absorbs moisture and is hard, it should not be used as a spray.
powder
If the powder absorbs moisture and agglomerates during storage, it needs to be placed in a cool and ventilated place to dry. Do not use it after sun exposure or crushing.
If the agglomeration is serious, it can only be used for toxic soil.
Emulsifiable oil
In the process of storage of emulsion pesticides , if they are not properly stored, the following three situations may occur:
Agglomeration. If the emulsified concentrate has a non-flowing viscous liquid or has formed a soapy solid, it proves that the solvent has been mostly volatilized and the quality has changed and cannot be used.
Precipitation crystallization. For long-term storage of the emulsion, there will be white crystals on the bottom of the bottle or turbidity. If the emulsified milk bottle is immersed in 30-40 warm water, the crystallization will dissolve in about 30 minutes and return to a transparent liquid, indicating that the quality is still good and can be used. If it does not dissolve, it indicates that the quality of the cream has changed and cannot be used.
Changes in the emulsifying properties of the cream. Take 1 part of emulsifiable concentrate, add 200 parts of water, put it in a glass cup, shake it and let it stand for about half an hour. Observe the emulsification. If there is no oil slick in the upper layer, there is no precipitation in the lower layer, no obvious oil beads in the middle, indicating that the emulsification performance is good; There is emulsifiable concentrate, there is sediment underneath, and there is delamination after 10 minutes, indicating that the emulsion is destroyed and cannot be used.
More pesticide knowledge , please pay attention to China Pesticide Network
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